Should I test??

Before I can return to work I have to have a negative test. I have been taking test from my Doctor using LabCorp. Took one this week and they did a screen, I asked for a GC/MS so they screwed it up, again. The last test I had that was a GC/MS was 22 days ago it was at 20ng/mL, and 21 days before that it was at 44 ng/mL and 3 day before that one it was 51ng/mL. All & all, 80 days since I last got high. So should I be below the 15 ng/mL to be called Negative by now ? I don't have any beliefs on this "half-life" thing. I have read it's .8 to 13 days, well I went from 44 to 20 in 3 weeks, unless that's just the way my body is, I'm mid 40s 5'10, 160. If I come up positive I will be fired, should I chance it?

You know you will get better info from the other place. I read that one and sec gave you good advice. Call around to find a LDL testing place.